[Functions] Remove incorrect assertion about master key

Author: ggailey777

articles/azure-functions/function-keys-how-to.md

@@ -29,7 +29,7 @@ The scope of an access key and the actions it supports depend on the type of acc
 | ----- | ----- | ---- | ---- |
 | **Function** | `default` or user defined | `function` | Allows access only to a specific function endpoint. |
 | **Host** | `default` or user defined | `function` | Allows access to all function endpoints in a function app. |
-| **Master** | `_master` | `admin` | Special host key that also provides administrative access to the runtime REST APIs in a function app. This key can't be revoked. Because the master key grants elevated permissions in your function app, you shouldn't share this key with third parties or distribute it in native client applications. |
+| **Master** | `_master` | `admin` | Special host key that also provides administrative access to the runtime REST APIs in a function app. Because the master key grants elevated permissions in your function app, you shouldn't share this key with third parties or distribute it in native client applications. |
 | **System** | Depends on the extension | n/a | Specific extensions might require a system-managed key to access webhook endpoints. System keys are designed for extension-specific function endpoints that get called by internal components. For example, the [Event Grid trigger](functions-bindings-event-grid-trigger.md) requires that the subscription use a system key when calling the trigger endpoint. Durable Functions also uses system keys to call [Durable Task extension APIs](durable/durable-functions-http-api.md). <br/>System keys can only be created by specific extensions, and you can't explicitly set their values. Like other keys, you can generate a new value for the key from the portal or by using the key APIs. | 
 
 Each key is named for reference, and there's a default key (named `default`) at the function and host level. Function keys take precedence over host keys. When two keys are defined with the same name, the function key is always used.